In World War II, the greatest threat to the British navy is the German battleship Tirpitz. While anchored in a Norwegian fjord, it is impossible to attack by conventional means, so a plan is hatched for a special commando unit to attack it, using midget submarines to plant underwater explosives.
| Production | William MacQuitty | Producer |
| Art | George Provis | Art Direction |
| Writing | Robin Estridge | Screenplay |
| Production | Earl St. John | Executive Producer |
| Sound | Arthur Benjamin | Original Music Composer |
| Directing | Ralph Thomas | Director |
| Editing | Gerald Thomas | Editor |
| Camera | Ernest Steward | Director of Photography |
